<template>
  <div :class="bem()" class="flex px-2 py-1.5 items-center">
    <slot name="headerTitle" v-if="slots.headerTitle"></slot>
    <BasicTitle :helpMessage="helpMessage" v-if="!slots.headerTitle && title">
      {{ title }}
    </BasicTitle>
    <div class="flex items-center flex-1 cursor-pointer justify-self-stretch" v-if="search || toolbar">
      <div :class="getInputSearchCls" v-if="search">
        <InputSearch :placeholder="t('common.searchText')" allowClear v-model:value="searchValue" />
      </div>
      <Dropdown @click.prevent v-if="toolbar">
        <Icon icon="ion:ellipsis-vertical" />
        <template #overlay>
          <Menu @click="handleMenuClick">
            <template v-for="item in toolbarList" :key="item.value">
              <MenuItem v-bind="{ key: item.value }">
                {{ item.label }}
              </MenuItem>
              <MenuDivider v-if="item.divider" />
            </template>
          </Menu>
        </template>
      </Dropdown>
    </div>
  </div>
</template>
<script lang="ts" setup>
import { computed, ref, watch, useSlots } from 'vue'
import { Dropdown, Menu, MenuItem, MenuDivider, InputSearch } from 'ant-design-vue'
import { Icon } from '@/components/Icon'
import { BasicTitle } from '@/components/Basic'
import { useI18n } from '@/hooks/web/useI18n'
import { useDebounceFn } from '@vueuse/core'
import { createBEM } from '@/utils/bem'
import { ToolbarEnum } from '../types/tree'

const searchValue = ref('')

const [bem] = createBEM('tree-header')

const props = defineProps({
  helpMessage: {
    type: [String, Array] as PropType<string | string[]>,
    default: ''
  },
  title: {
    type: String,
    default: ''
  },
  toolbar: {
    type: Boolean,
    default: false
  },
  checkable: {
    type: Boolean,
    default: false
  },
  search: {
    type: Boolean,
    default: false
  },
  searchText: {
    type: String,
    default: ''
  },
  checkAll: {
    type: Function,
    default: undefined
  },
  expandAll: {
    type: Function,
    default: undefined
  }
} as const)
const emit = defineEmits(['strictly-change', 'search'])

const slots = useSlots()
const { t } = useI18n()

const getInputSearchCls = computed(() => {
  const titleExists = slots.headerTitle || props.title
  return [
    'mr-1',
    'w-full',
    {
      ['ml-5']: titleExists
    }
  ]
})

const toolbarList = computed(() => {
  const { checkable } = props
  const defaultToolbarList = [
    { label: t('component.tree.expandAll'), value: ToolbarEnum.EXPAND_ALL },
    {
      label: t('component.tree.unExpandAll'),
      value: ToolbarEnum.UN_EXPAND_ALL,
      divider: checkable
    }
  ]

  return checkable
    ? [
        { label: t('component.tree.selectAll'), value: ToolbarEnum.SELECT_ALL },
        {
          label: t('component.tree.unSelectAll'),
          value: ToolbarEnum.UN_SELECT_ALL,
          divider: checkable
        },
        ...defaultToolbarList,
        { label: t('component.tree.checkStrictly'), value: ToolbarEnum.CHECK_STRICTLY },
        { label: t('component.tree.checkUnStrictly'), value: ToolbarEnum.CHECK_UN_STRICTLY }
      ]
    : defaultToolbarList
})

function handleMenuClick(e) {
  const { key } = e
  switch (key) {
    case ToolbarEnum.SELECT_ALL:
      props.checkAll?.(true)
      break
    case ToolbarEnum.UN_SELECT_ALL:
      props.checkAll?.(false)
      break
    case ToolbarEnum.EXPAND_ALL:
      props.expandAll?.(true)
      break
    case ToolbarEnum.UN_EXPAND_ALL:
      props.expandAll?.(false)
      break
    case ToolbarEnum.CHECK_STRICTLY:
      emit('strictly-change', false)
      break
    case ToolbarEnum.CHECK_UN_STRICTLY:
      emit('strictly-change', true)
      break
  }
}

function emitChange(value?: string): void {
  emit('search', value)
}

const debounceEmitChange = useDebounceFn(emitChange, 200)

watch(
  () => searchValue.value,
  (v) => {
    debounceEmitChange(v)
  }
)

watch(
  () => props.searchText,
  (v) => {
    if (v !== searchValue.value) {
      searchValue.value = v
    }
  }
)
</script>
